2:43
\"One, this is a country that has a reputation for using those kinds of weapons on people, and we know they have a program,\" Kirby added. \"And two, we continue to watch for the potential -- and I want to stress the word potential -- potential that they could be banging this drum with the intent of creating some sort of false-flag event, that they could use it as an excuse to escalate the conflict even more.\"
Russia escalates false chemical weapons claims
Russia, meanwhile, has doubled down on false claims that the U.S. is helping Ukraine develop chemical or biological weapons, bringing the accusations to the world's stage at the U.N. Security Council Friday in an emergency session.
\"I can foresee what the reaction will be from our Western colleagues, who I am sure are going to be saying now that all of this information is fake and Russian propaganda, but this is self-delusion and I do not think this will be helpful to the European people in case there are outbreaks in Ukraine and neighboring states,\" said U.N. Ambassador for Russia Vassily Nebenzya.
Russia has not supplied any credible information to support their claims, but a web of disinformation spread the conspiracy theory this week -- heightening concern among U.S. and Ukrainian officials that Russia itself may be planning to deploy chemical or biological weapons against Ukrainian targets or as part of a so-called \"false flag\" operation.
![\"PHOTO:](\"http://a.abcnews.com/images/International/putin-belarus-rt-rc-220311_1647015505931_hpMain_4x3t_384.jpg\")
\"I will say this once: Ukraine does not have a biological weapons program, and there are no Ukrainian biological weapons laboratories supported by the United States. Not near Russia's border or anywhere,\" rebutted U.N. Ambassador for Linda Thomas-Greenfield. \"Ukraine owns and operates its own public health laboratory infrastructure,\" she continued. \"It has absolutely nothing to do with biological weapons.\"
Reports of Russia sending chem-bio suits to Ukraine
A senior administration official told ABC News Chief Global Affairs Correspondent Martha Raddatz that aside from the so-called \"false flag operations\" -- in which Russians are accusing Ukraine and the U.S. of a possible chemical or biological attack -- the U.S. is receiving reports that the Russians are starting to bring in chem-bio suits to Ukraine.
\"We believe it is an ominous sign they are possibly doing it for cover,\" the official said of the Russian pretext.
The official also said that as much as one-fifth of the Russian force is now \"inoperable\" -- meaning they are either dead, wounded or don't have the support or equipment needed to continue right now -- but there are still fears forces could take Kyiv as it wears down Ukraine.
JUST IN: \"Russia would pay a severe price if they used chemical weapons,\" Pres. Biden says.
— ABC News Politics (@ABCPolitics) March 11, 2022
The U.S. has warned of \"indications\" Russia could use false claims about biochemical weapons as excuse to use them. Read more: https://t.co/Sf8pQJpYWb pic.twitter.com/ztDWqEIv5P
Ukrainian President Volodymyr Zelenskyy said in a televised address late Thursday, that Russia falsely accusing Ukraine of preparing for a chemical attack \"makes me really worried, because we've been repeatedly convinced if you want to know Russia's plans, look at what Russia accuses others of.\"
Thomas Greenfield added Friday, \"In fact, it is Russia that has long maintained a biological weapons program in violation of international law. It is Russia that has a well-documented history of using chemical weapons. It is Russia who is the aggressor here,\" she said, pointing out the Kremlin's recent history of poisoning political enemies and supporting the Assad regime's use of chemical weapons in Syria.
Pentagon pushes back against Russia's false claim
A senior defense official said Friday that despite the barrage of claims from China and Russia, the U.S. is not helping Ukraine create any chemical or biological weapons.
\"We have nothing to hide, and the only reason why we elevated the discussion is because the Russians and the Chinese decided to lie about it -- just flat out lie,\" the official added. But they would not offer any U.S. intelligence assessment of the likelihood of Putin deploying chemical or biological weapons in Ukraine.
\"We know that the Russians have had -- and we assess that they still have -- a sophisticated chemical and biological weapons program. I'm not going to talk about intelligence assessments about what they may do with that program or what, if any, designs they might have on Ukraine in that regard,\" the official said.
A Pentagon official told reporters Thursday it has \"picked up indications that the Russians could be making these claims -- these false claims -- about us and Ukrainian work in biodefense as a way of creating a pretext of their own, to perhaps use these kinds of agents in an attack.\"
![\"PHOTO:](\"http://a.abcnews.com/images/International/dnipro-ukraine-rc-220311_1647007603594_hpMain_4x3t_384.jpg\")
Pressed on what \"indications\" they were referring to, they added, \"I have to leave it with you with indications, and [I'm] not going to be at liberty to go in more detail than that today.\"
Amid the looming threat, the World Health Organization has urged Ukraine to now destroy pathogen samples because Russia's war in the country risks an \"accidental spill.\"
\"This is part of us providing public health advice to every country to try to ensure there is a minimized risk of any harm to population because of any possible accidental leak of pathogens,\" said WHO spokesperson Tarik Jašarević said from Lviv, Ukraine.
ABC News' Conor Finnegan, Luis Martinez and Matt Seyler contributed to this report.
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